Relevant bibliographies by topics / Graphene Nano-Dots

Academic literature on the topic 'Graphene Nano-Dots'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Graphene Nano-Dots"

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Lee, Ki Hyun, Hun Park, Wonsik Eom, Dong Jun Kang, Sung Hyun Noh, and Tae Hee Han. "Graphene quantum dots/graphene fiber nanochannels for osmotic power generation." Journal of Materials Chemistry A 7, no. 41 (2019): 23727–32. http://dx.doi.org/10.1039/c9ta05242a.

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Graphene quantum dots were intercalated into graphene fiber nanochannel as a nano-charger for high surface charge density. The hybrid nanochannel shows efficient ion transport behaviors and ion selectivity facilitating superior osmotic power generation.
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Manoj, B., Ashlin M. Raj, and George Thomas Chirayil. "Facile synthesis of preformed mixed nano-carbon structure from low rank coal." Materials Science-Poland 36, no. 1 (May 18, 2018): 14–20. http://dx.doi.org/10.1515/msp-2018-0026.

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Abstract Coal is a natural energy resource which is mainly used for energy production via combustion. Coal has nanocrystals embedded in it, formed during the coalification process, and is an ideal precursor for nano-carbon dots and diamonds. Herein, we report a facile top-down method to synthesise nanodots and diamonds of the size of 5 nm to 10 nm from three different types of coal by simple chemical leaching. TEM analysis revealed the formation of a mixture of carbon dots, graphene layers, and quantum dots in bituminous coal and sub-bituminous coal. Raman analysis confirmed the existence of synthesized nanodiamond and nano-carbon mixed phase with defects associated with it. It is concluded that graphene quantum dots, nanodiamonds, graphene sheets and carbon dots present in coal can be extracted by simple chemical treatment. These structures can be tuned to photoluminescent material for various optoelectronic applications or energy harvesting devices like super capacitors.
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Wang, Shujun, Ivan S. Cole, and Qin Li. "The toxicity of graphene quantum dots." RSC Advances 6, no. 92 (2016): 89867–78. http://dx.doi.org/10.1039/c6ra16516h.

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This review provides a comprehensive account on the current research status regarding the toxicity of graphene quantum dots (GQDs) – a new nano material with profound potential in various advanced applications.
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Armaghani, Sahar, Ali Rostami, and Peyman Mirtaheri. "Interaction between Graphene Nanoribbon and an Array of QDs: Introducing Nano Grating." Photonics 9, no. 5 (May 15, 2022): 348. http://dx.doi.org/10.3390/photonics9050348.

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In this work, the interaction between an array of QDs and Graphene nanoribbon is modeled using dipole–dipole interaction. Then, based on the presented model, we study the linear optical properties of the considered system and find that by changing the size, number, and type of quantum dots as well as how they are arranged, the optical properties can be controlled and the controllable grating plasmonic waveguides can be implemented. Therefore, we introduce different structures, compare them together and find that each of them can be useful based on their application in optical integrated circuits. The quantum dot arrays are located on a graphene nanoribbon with dimensions of 775 × 40 nm2. Applying electromagnetic waves with a wavelength of 1.55 µm causes polarization in the quantum dots and induces surface polarization on graphene. It is shown that, considering the large radius of the quantum dot, the induced polarization is increased, and ultimately the interaction with other quantum dots and graphene nanoribbon is stronger. Similarly, the distance between quantum dots and the number of QDs on Graphene nanoribbon are basic factors that affect the interaction between QDs and nanoribbon. Due to the polarization effect of these elements between each other, we see the creation of the effective grating refractive index in the plasmonic waveguide. This has many applications in quantum optical integrated circuits, nano-scale atomic lithography for nano-scale production, the adjustment coupling coefficient between waveguides, and the implementation of optical gates, reflectors, detectors, modulators, and others.
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Liu, Yiyang, and Doo Young Kim. "Ultraviolet and blue emitting graphene quantum dots synthesized from carbon nano-onions and their comparison for metal ion sensing." Chemical Communications 51, no. 20 (2015): 4176–79. http://dx.doi.org/10.1039/c4cc07618d.

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Ganganboina, Akhilesh Babu, Enoch Y. Park, and Ruey-An Doong. "Boosting the energy storage performance of V2O5 nanosheets by intercalating conductive graphene quantum dots." Nanoscale 12, no. 32 (2020): 16944–55. http://dx.doi.org/10.1039/d0nr04362a.

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V2O5 nanosheets have been nano-engineered with 0D graphene quantum dots via a hydrothermal method, their outstanding electrochemical properties for high-performance supercapacitors are demonstrated.
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Zhang, Chenguang, Jiajun Li, Xianshun Zeng, Zhihao Yuan, and Naiqin Zhao. "Graphene quantum dots derived from hollow carbon nano-onions." Nano Research 11, no. 1 (June 27, 2017): 174–84. http://dx.doi.org/10.1007/s12274-017-1617-0.

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Dong, Yongqiang, Huan Wu, Pengxiang Shang, Xiaoting Zeng, and Yuwu Chi. "Immobilizing water-soluble graphene quantum dots with gold nanoparticles for a low potential electrochemiluminescence immunosensor." Nanoscale 7, no. 39 (2015): 16366–71. http://dx.doi.org/10.1039/c5nr04328j.

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Nano-hybrids of hydrazide-modified graphene quantum dots (HM-GQDs)/gold nanoparticles (AuNPs) prepared from the redox reaction between HM-GQDs and AuCl4− were used for electrochemiluminescent immunosensor of carcinoembryonic antigen.
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Luo, Liu, Sheng-Heng Chung, and Arumugam Manthiram. "A three-dimensional self-assembled SnS2-nano-dots@graphene hybrid aerogel as an efficient polysulfide reservoir for high-performance lithium–sulfur batteries." Journal of Materials Chemistry A 6, no. 17 (2018): 7659–67. http://dx.doi.org/10.1039/c8ta01089g.

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A free-standing self-assembled graphene aerogel embedded with SnS2nano-dots (SnS2-ND@G) is established as an efficient substrate for high-loading sulfur cathodes with synergistically physical and chemical polysulfide-trapping capability.
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Wang, Shujun, Ivan S. Cole, Dongyuan Zhao, and Qin Li. "Quasi-Continuously Tuning the Size of Graphene Quantum Dots via an Edge-Etching Mechanism." MRS Advances 1, no. 20 (2016): 1459–67. http://dx.doi.org/10.1557/adv.2016.198.

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ABSTRACTGraphene quantum dots (GQDs), a nano version of graphene whose interesting properties that distinguish them from bulk graphene, have recently received significant scientific attention. The quantum confinement effect referring to the size-dependence of physical and chemical properties opens great possibility in the practical applications of this material. However, tuning the size of graphene quantum dots is still difficult to achieve. Here, an edge-etching mechanism which is able to tune the size of GQDs in a quasi-continuous manner is discovered. Different from the ‘unzipping’ mechanism which has been adopted to cut bulk graphitic materials into small fragments and normally cut through the basal plane along the ‘zig-zag’ direction where epoxy groups reside, the mechanism discovered in this research could gradually remove the peripheral carbon atoms of nano-scaled graphene (i.e. GQDs) due to the higher chemical reactivity of the edge carbon atoms than that of inner carbon atoms thereby tuning the size of GQDs in a quasi-continuous fashion. It enables the facile manipulate of the size and properties of GQDs through controlling merely the reaction duration. It is also believed the as discovered mechanism could be generalized for synthesizing various sizes of GQDs from other graphitic precursors (e.g. carbon fibres, carbon nanotubes, etc).
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Dissertations / Theses on the topic "Graphene Nano-Dots"

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Liu, Yiyang. "PHOTOLUMINESCENCE MECHANISM AND APPLICATIONS OF GRAPHENE QUANTUM DOTS." UKnowledge, 2017. http://uknowledge.uky.edu/chemistry_etds/78.

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Graphene quantum dots (GQDs) are small pieces of graphene oxide whose physical dimensions are so confined (a few to a few tens nm) that they have a finite bandgap due to a quantum confinement effect. The finite bandgap of GQDs grants them pronounced absorption bands and a substantial photoluminescence. These optical properties are rarely observed in traditional carbon materials, since most of carbon materials are metallic with a near-zero bandgap and thus have broad absorption spectra with no photoluminescence. The unique optical properties of GQDs, along with GQDs’ inherited advantages from carbon material family (cheap, abundant, non-toxic), make GQDs an attractive material for various applications such as bio-imaging, photoinduced therapy, chemical and metal ion sensors, and photovoltaic devices. Despite of their great potential, several great challenges need to be overcome to enable wider applications. One challenge is the fact that GQDs prepared by typical chemical methods possess significant inhomogeneity, so the precise control of the dimension and surface functionalities is very difficult. Due to the inhomogeneity of GQDs in terms of dimensions and surface functionalities, it is challengeable to establish a precise structure-property relationship. As of today, it is still under debate how surface functional groups of GQDs are responsible for the photoluminescence mechanism, photophysics, and photochemistry. This dissertation is mainly to provide a dedicated study about the photoluminescence mechanism and structure-property relations of GQDs.
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Puddy, Reuben Kahan. "Transport spectroscopy of graphene quantum dots fabricated by atomic force microscope nano-lithography." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/265578.

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In this report we detail our work fabricating and measuring graphene quantum dots. We investigate a technique, relatively widely used in several other materials but not yet well investigated in graphene, known as Atomic Force Microscope Lithography (AFML). We then use AFML to fabricate graphene quantum dot systems. Transport measurements are carried out on our graphene quantum dots at low temperatures and high parallel magnetic fields and we try to understand the behaviour of spins in graphene. In our initial investigations into AFML we use graphene samples electrically contacted using standard electron-beam lithography. We were able to cut the graphene lattice by applying a negative voltage to the AFM tip and moving the tip across a grounded graphene surface. We have shown, by measuring the current through the AFM tip during lithography, that cutting of graphene is not current driven. Using a combination of transport measurements and scanning electron microscopy we show that , while indentations accompanied by tip current appear in the graphene lattice for a range of tip voltages, real cuts are characterized by a strong reduction of the tip current above a threshold voltage. The flexibility of the technique was then demonstrated by the fabrication, measurement, modification and re-measurement of graphene nanodevices with resolution down to 15 nm. We subsequently developed a shadow-masking technique to electrically contact graphene samples thus eliminating the use of chemical resists and the associated contamination of the graphene surface. With these pristine samples we were able to oxidise and hydrogenate the graphene using AFML. A graphene quantum dot was then fabricated using AFML oxidation. We also fabricated a graphene quantum dot using e-beam lithography in combination with oxygen plasma etching. We studied electron spin physics in these structures by J:1pplying large parallel magnetic fields at low temperatures and performing electrical transport measurements. We do not find an ordered filling sequence of spin states, which we assign to edge disorder and surface charge impurities.
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De, Cecco Alessandro. "Electronique quantique dans les nano-structures explorées par microscopie à sonde locale." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY035/document.

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Les nano-structures sont des systèmes physiques de premier intérêt pour les études de base et pour les applications, car elles montrent des effets quantiques comme le confinement, la discrétisation énergétique, la cohérence... Le comportement quantique des nano-dispositifs peut être cependant fortement influencé par le désordre, les effets thermiques et hors-équilibre. Dans cette Thèse, nous montrons, par exemple, comment la dissipation affecte le transport électronique dans les dispositifs supraconducteurs soumis aux fréquences micro-ondes.En utilisant un setup cryogénique AFM/STM fait maison, on peut étudier différents types de nano-structures. En premier, nous nous occupons de la réalisation d'un transistor à électron unique avec une sonde locale. Les nano-particules métalliques sont bien connues pour leur comportement comme boîtes quantiques zéro-dimensionnelles (QD), elles montrent du confinement quantique et des effets de charge, que l’on retrouve aussi dans nos mesures de microscopie à sonde locale à basse température. Nous démontrons comment un nouveau procédé de nano-fabrication peut être mis en œuvre avec l'introduction d' une électrode de grille suffisamment mince et sans-fuite, ce qui pourra fournir un réglage de précision des propriétés de la boîte quantique et permettre l'exploration résolue spatialement des phénomènes quantiques dans différents régimes de couplage. En deuxième, nous étudions le graphène épitaxial sur SiC comme un matériau 2D très prometteur pour l'électronique. En particulier, les nano-rubans de graphène obtenus par croissance épitaxiale sur des parois inclinées (GNRs) sont des nano-structures d'intérêt fondamental qui peuvent fournir un accès direct et contrôlable au graphène neutre. À cause du confinement quantique, ces systèmes peuvent montrer du transport balistique exceptionnel à température ambiante. Nous réalisons une technique novatrice de potentiométrie à sonde locale qui nous permet une résolution spatiale à l'échelle du nm et une résolution en tension à l'échelle du µV. Le potentiel locale et la résistance locale mesurés sur un dispositif unique basé sur des nano-rubans de graphène nous donnent des indications claires de transport non-diffusif.La physique explorée, les méthodes ainsi que les technique développées dans cette Thèse peuvent donc fournir des nouvelles visions aux nombreux (et assez divers) sujets en vogue
Nanostructures are physical systems of paramount interest for both fundamental studies and applications, since they display quantum effects such as confinement, energy discretization, coherence…The quantum behavior of nano-devices can however be strongly influenced by disorder, thermal and non-equilibrium effects. In this Thesis, we show, for instance, how dissipation deeply affects the electron transport in superconducting nano-devices at microwave frequencies.By using a home-made cryogenic AFM/STM setup, we are able to investigate different kinds of nanostructures. First, we address the realization of a Single Electron Transistor with a Scanning Probe. Metallic nanoparticles are well known for their behavior as 0D-Quantum Dots (QD), and they display quantum confinement and charging effects, which are evidenced in our low-temperature SPM measurements as well. We demonstrate how a novel nanofabrication process can be implemented with the addition of gate electrodes sufficiently thin and leakage-proof, which in the future can provide a fine-tuning of the QD's properties and allow spatially-resolved exploration of quantum phenomena in a variety of different coupling regimes. Second, we study epitaxial graphene on SiC as a very promising 2D material for electronics. In particular, epitaxial sidewalls graphene nanoribbons (GNRs) are nanostructures of fundamental interest which can provide direct and controllable access to charge neutral graphene. Due to quantum confinement, these systems can display exceptional ballistic transport at room temperature. We implemented an innovative Scanning Tunneling Potentiometry technique allowing for nm-scale spatial resolution and μ V-scale voltage resolution. Measured local potential and resistance of single GNRs devices provide clear indication of non-diffusive transport.The physics investigated and the methods and the techniques developed in this Thesis can thus provide a new insight on several (and quite diverse) on-trend topics
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Wang, Hongzhen. "Caractérisation optique non linéaire dans le visible, l’UV et l’IR en régime picoseconde. : cas des solvants liquides les plus utilisés, du niobate de lithium et des nano-feuilles de graphène." Thesis, Angers, 2019. http://www.theses.fr/2019ANGE0009/document.

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Cette étude concerne la caractérisation optique non linéaire (NL) principalement d’ordre 3 dans le visible, l’UV et l’IR en régime picoseconde de différents matériaux tels que certains solvants, le niobate de lithium et les nano-feuilles de graphène. Nous présentons d’abord les expressions des susceptibilités NL. Nous décrivons ensuite la technique de caractérisation Z-scan et ses variantes. Nous présentons une nouvelle méthode qui combine les avantages de Z-scan avec ceux de la microscopie en champ sombre. Nous montrons que cette technique d’imagerie, nommée DFZscan (Dark Field Z-scan), peut mesurer les coefficients de réfraction NL en présence d'une forte absorption NL. Les résultats expérimentaux montrent une importante amélioration de la sensibilité. Finalement, nous comparons les réponses NL des solvants les plus utilisés, dont l’eau qui possède la réfraction NL la plus faible. Ce liquide est utilisé pour caractériser la réponse NL d’une suspension de points quantiques de graphène. Grâce à un modèle simple, nous estimons l'indice de réfraction et d’absorption NL d'une nanofeuille de graphène monocouche. Nous étudions également les non linéarités d’ordres supérieurs dans les matériaux liquides (toluène) et solides (LiNbO3) en vue d’applications potentielles pour la génération de la deuxième harmonique et des modulateurs de guides d'ondes. Ces coefficients peuvent intéresser une grande communauté de chercheurs dans des domaines aussi variés que la filamentation, les solitons, le traitement tout optique du signal et les réseaux de télécommunications
This study concerns the nonlinear (NL) optical characterization mainly of order 3 in the visible, UV and IR in the picosecond regime of different materials such as solvents, lithium niobate and graphene nanosheets. We first present the expressions of NL susceptibilities. We then describe the Z-scan characterization technique and its variants. We present a new method that combines the advantages of Z-scan with those of dark field microscopy. We show that this imaging technique, called DFZ-scan (Dark Field Z-scan), can measure NL refractive coefficients in the presence of high NL absorption. The experimental results show a significant improvement in the sensitivity. Finally, we compare the NL responses of the most commonly used solvents, including water with the lowest NL refraction. This liquid is used to characterize the NL response of a suspension of graphene quantum dots. Using a simple model, we estimate the refractive index and absorption index NL of a single-layer graphene nanosheet. We also studied higher order non-linearities in liquid (toluene) and solid (LiNbO3) materials for potential applications in second harmonic generation and waveguide modulators. These coefficients can be of interest to a large community of researchers in fields as diverse as filamentation, soliton, all-optical signal processing and telecommunications networks
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Jussi, Johnny. "Fluorescent quantum dots and graphene-based sensors for forensic applications." Licentiate thesis, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262750.

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A key emerging concept within the forensic sciences today areportable measurementdevices, where a much more efficient usage of the resources involved with crime-solving is possible if confirmatory measurements can be realised directly at a crimescene with such devices. Today, the majority of the presently used methods duringcriminal investigation at a crime scene involves measurements of a presumptivenature, which is a vital tool as it enables the screening of samples. In this thesis,the overarching goal is the development of tool kits for the analysis of biosampleson-site at a crime scene. This is mainly investigated through two routes: theusage of Quantum Dots (QDs) as a recognition element in sensory applications andfabrication of a graphene-based device for the detection of illicit drugs.The investigations conducted for the studies presented in this thesis focuses onsensory applications with a forensic detection scheme in mind: study I reveals in-trinsic properties of QDs to better understand sensing mechanisms upon bindinginteractions; study II demonstrates the fabrication of a graphene-based device forthe detection of illicit drugs; study III showcases the functionalised and bioconju-gated of QDs for a specific investigation into a biological process; study IV furtherthe investigation into the possible side-effects of QDs on biological specimens.In study I we numerically and experimentally investigate the intrinsic blinkingcharacteristics of CdSe-CdS/ZnS QDs. This includes a thorough examination of theexperimental parameters of the measurement setup: the bin time and excitationpower. Different mechanisms between the off- and on-state probability distributionsare found, wherein the on-state follows the random telegraph signal theory and theoff-state follows the inverse power law distribution.In study II, the detection of illicit drugs (amphetamine and cocaine) is achievedthrough graphene-based sensors processed to contain metal electrodes with superioradhesion and low contact resistance. The construction of a microfluidic system isfurther realised for a detection of molecules based on non-covalent interactions.With this system, a wavelength-dependent photoactivity for amphetamine and arange of its chemical analogs is demonstrated. A molecule dependent interactionwith the graphene surface is shown of the graphene surface either in the form ofp-doping (cocaine) or n-doping (amphetamine).Study III investigates the endocytic pathway of the vascular cell adhesionmolecule 1 (VCAM1) in Human Umbilical Vein Endothelial Cells (HUVECs) in-iiiivABSTRACTduced by Tumor Necrosis Factorα(TNFα) with the usage of 3-Mercaptopropionicacid coated (3MPA)-QDs and 5-Carboxyfluorescein (5FAM) functionalised and la-belled with VCAM1 binding peptides, respectively. Internalisation of the VCAM1molecules into lysosomes is shown with light microscopy through observations ofdifferent pathways of the 5FAM labelled peptides and functionalised QDs.In study IV we investigate the adverse effects of 3MPA-QDs on the humanairway epithelium by an examination of the calcium response in lung cells upon astimulation with QDs. The cellular response to the deposition of QDs is observedwith light microscopy and electrical measurements as a global increase of Ca2+in the epithelial layers and a transient decrease in the electrical response. Theseobservations imply that the influx of calcium caused by the QD deposition is inducedby mechanical stressIn an additional ongoing study, the age determination of dried blood spotsare investigated with the usage of protein markers commonly found in the blood.Human serum (HS) is spiked with a marker of interest to mimic those of normallevels in adult human males. After which the HS is allowed to undergo an ageingprocess in a 96 well plate and further analysed in terms of the enzymatic activitywith commercially available kits. The preliminary test results show that there is ameasurable change of activity dependenton the utilised marker that may act as abasis for the age determination of dried blod spots

Examinator: Professor Björn Önfelt

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Book chapters on the topic "Graphene Nano-Dots"

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Snook, Ian, and Amanda Barnar. "Graphene Nano-Flakes and Nano-Dots: Theory, Experiment and Applications." In Physics and Applications of Graphene - Theory. InTech, 2011. http://dx.doi.org/10.5772/15541.

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Balachandran, Manoj. "Extraction of Preformed Mixed Phase Graphene Sheets from Graphitized Coal by Fungal Leaching." In Handbook of Research on Inventive Bioremediation Techniques, 287–99. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2325-3.ch012.

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The potential use of coal as source of carbon nano structure is seldom investigated. Herein we report a facile fungal solubilization method to extract mixed phase carbon structure from low grade coal. Coal had been used as a primary source for the production of carbon nanostructure with novel property, in addition to its main utility as a fuel. The major hurdle in its application is the inherent mineral embedded in it. An environmentally benign demineralization procedure make coal as a widely accepted precursor for the novel carbon materials. With Aspergiilus niger leaching, the randomly oriented preformed crystalline mixed phase nanocarbon in coal can be extracted. Raman studies revealed the presence of E2g scattering mode of graphite. The sp3 domains at ~1355 cm-1 (D band) is an indication of diamond like structure with disorder or defect. In the 2D region, multilayer stacking of graphene layers is noticed. The ratio of the defect to graphitic bands was found to be decreasing with increasing rank of coal. Bio leaching of coal enhances the carbon content in coal while eliminating the associated minerals in it. These defected carbon is an ideal material for graphene quantum dots and carbon dots, which are useful in drug delivery and bio imaging applications.
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"Applications of Quantum Dots in Supercapacitors." In Materials Research Foundations, 169–90. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901250-7.

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Quantum dots (QDs) are a new class of zero-dimensional (0D) nanomaterials having unique electronic and optical properties along with biocompatibility, chemical inertness, dispersibility in water, and high specific surface area that gives them potential for biological, optoelectronic and energy related applications. Among them, charge storage supercapacitor (SC) devices have been intensively studied as the nano-sized QDs act as an excellent interface to stimulate an enhanced interaction between electrode and electrolyte resulting in superior charge storage properties of the SC. In this chapter, the latest research progress on the five representative types of QDs namely carbon nanodots (CNDs), graphene QDs (GQDs), polymer QDs (PQDs), transition metal oxide (TMO) and dichalcogenide (TMD) QDs are comprehensively introduced and their influence on the final charge storage properties of supercapacitor devices is emphatically discussed in detail. Finally, a brief outlook is given, pointing out the challenges which remain to be settled before adoption of QDs can be of widespread utility for near future energy-functional devices.
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Kumar, Sunil, and Abhay Nanda Srivastva. "Application of Carbon Nanomaterials Decorated Electrochemical Sensor for Analysis of Environmental Pollutants." In Analytical Chemistry - Advancement, Perspectives and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96538.

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Carbon nanomaterials (CNMs), especially carbon nanotubes and graphene, have been attracting tremendous attention in environmental analysis for rapid and cost effective detection of various analytes by electrochemical sensing. CNMs can increase the electrode effective area, enhance the electron transfer rate between the electrode and analytes, and/or act as catalysts to increase the efficiency of electrochemical reaction, detection, adsorption and removal are of great significance. Various carbon nanomaterials including carbon nanotubes, graphene, mesoporous carbon, carbon dots exhibited high adsorption and detection capacity. Carbon and its derivatives possess excellent electro catalytic properties for the modified sensors, electrochemical methods usually based on anodic stripping voltammetry at some modified carbon electrodes. Metal electrode detection sensitivity is enhanced through surface modification of working electrode (GCE). Heavy metals have the defined redox potential. A remarkable deal of efficiency with the electrochemical sensors can be succeeded by layering the surface of the working electrode with film of active electro-catalytic species. Usually, electro catalysts used for fabrication of sensors are surfactants, nano-materials, polymers, carbon-based materials, organic ligands and biomaterials.
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Panda, Debabrata, and Krunal M. Gangawane. "Next-Generation Energy Storage and Optoelectronic Nanodevices." In Current and Future Developments in Nanomaterials and Carbon Nanotubes, 223–39. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050714122030016.

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Among the variety of nanostructures that have been explored as a favorable material for the application of higher energy storage devices as supercapacitors, catalysts in high-performance batteries, proton exchange membranes in fuel cells, optoelectronic devices, and so on, 2D & 3D nanostructure of graphene-based derivatives, metal oxides and dichalcogenides have received the most potential attention for building high-performance nano-devices due to their extraordinary properties. Over the past decade, several efforts have been implemented to design, develop, and evaluate electrodes' structures for enhanced energy storage devices. A significant modification has achieved the remarkable performance of these synthesized devices in terms of energy storage capacity, conversion efficiency, and the reliability of the devices to meet practical applications' demands. Light-emitting diode (LED) in quantum well or quantum dots is considered an important aspect for an enhanced optoelectronic device. This current study outlines different 3D nanostructures for next generation energy storage devices. It provides a systematic summary of the advantages of 3D nanostructures in perspective to next-generation energy storage devices, photocatalytic devices, solar cells, a counter electrode for metal-ion batteries, and supercapacitors, optoelectronic nano-devices.
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V. Vakhrushev, Alexander. "Formation of Nanostructures on the Solid Surface." In Nanomechanics - Theory and Application. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101074.

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Forming nanostructures on the solids surface is one of the promising nanotechnological processes. It has been established that changes in the atomic structure of the solid surface due to the nanostructures formation result both in a significant change in various physical properties of the surface, and in an increase in its durability, strength, hardness, wear resistance. There are many different methods for forming nanostructures on solid surfaces: surface modification with nano-elements (nanoparticles, fullerenes and fullerites, graphene and nanotubes), formation of a nanocomposite layer on the surface, forming quantum dots and whiskers on the surface, implanting ions into the solid surface, laser surface treatment and other processes. The above processes are very complex and for their optimization require detailed research both by experimental and theoretical methods of mathematical modeling. The aim of this chapter was to provide a comparative review of different methods of forming nanostructures on the solids surface and mathematical modeling of these processes various aspects.
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Muñoz, Roberto, Mar García-Hernández, and Cristina Gómez-Aleixandre. "CVD of Carbon Nanomaterials: From Graphene Sheets to Graphene Quantum Dots." In Handbook of Carbon Nano Materials, 127–83. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814678919_0004.

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Conference papers on the topic "Graphene Nano-Dots"

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Niyitanga Manzi, Marie Aurore, and Omar R. Harvey. "EFFECTS OF THE CHEMISTRY OF GRAPHENE OXIDE QUANTUM DOTS AND DENDRIMER NANO-MATERIALS ON THEIR INTERACTION WITH IRON OXIDES SURFACES." In 54th Annual GSA South-Central Section Meeting 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020sc-343879.

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Kulah, Jonathan, and Ahmet Aykaç. "Synthesis and Characterization of Graphene Quantum Dots Functionalized Silver Nanoparticle from Moringa Oleifera Extracts." In 6th International Students Science Congress. Izmir International Guest Student Association, 2022. http://dx.doi.org/10.52460/issc.2022.050.

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Abstract:
Graphene quantum dots (GQDs) are famously known for large surface area, good dispersibility, good conductivity, and high transparency with good photochemical, electrochemical, and optical properties that are utilized in many biomedical and biotechnological applications. Interestingly, GQDs were reported to serve as an excellent reducing reagent in the synthesis of noble metal nanoparticles such as silver nanoparticles (AgNPs). Moreover, GQDs eradicate the limitation of impurities of AgNPs synthesized using plant extracts as a stabilizer and reducing agents. Therefore, we experimented GQDs synthesis from moringa oleifera (MO) plant extracts compared to citric and urea synthesized GQDs. And used the synthesized GQDs to synthesize, reduce and functionalize AgNPs. MO contains about 110 compounds, high nutrients, vitamins, oleic oil, and phytoconstituents such as alkaloids, flavonoids, glucosinolates, saponins, tannins, terpenes, steroids, phenolic acids, which suggested to us that, MO extracts can serve as a capping agent in the synthesis of nanoparticles. Initially, MO leaves and seeds water phase extracts were obtained by overnight distillation and lyophilized to create a stock solution of 1mg/ml. Next, following Das, R. et al and slightly modifying the followed method by varying the MO extract concentration from 20µL to 60 µL, AgNPs were synthesized by hydrothermal method. GQDs were separately synthesized adopting Tran, H.V. et al method and later added to the AgNPs forming a more stable hybrid structure that was characterized using the UV-vis spectroscopy (UV-Vis), Nano zeta sizer, Raman spectroscopy, and the Fourier Infrared transmission resonance (FTIR). As the concentration of MO extract increased, the color change intensity increased symbolizing the formation of AgNPs while the luminous bright solutions under the UV light symbolized the formation of GQDs. This study lay the foundation for further research and analysis to be done on the nanozyme or biosensor application of enhanced functionalized and stable hybrid AgNPs with GQDs.
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Kim, Do Hyeon, Adem H. Kulahlioglu, Hae Wook Han, and Byoung Don Kong. "Tunable Optical Absorption of Graphene Quantum Dots with Transition Metal Adatom." In 2021 IEEE 21st International Conference on Nanotechnology (NANO). IEEE, 2021. http://dx.doi.org/10.1109/nano51122.2021.9514357.

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Tzeng, Yonhua, and JiunChi Lai. "Graphene Quantum Dots and Silver Nanoparticles Based High Sensitivity SERS Molecular Sensors." In 2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2018. http://dx.doi.org/10.1109/nano.2018.8626397.

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Chen, Ying Ren, Cheng Lung Chung, Gideon Chen, and Yonhua Tzeng. "Independently controlled etching and growth of graphene quantum dots and their SERS applications." In 2016 IEEE 16th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2016. http://dx.doi.org/10.1109/nano.2016.7751493.

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Das, Ruma, and P. K. Giri. "Fluorescence based comparative study of interaction of perylene with nitrogen doped graphene quantum dots and graphene oxide sheets." In THE 3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (icONMAT 2019). Author(s), 2019. http://dx.doi.org/10.1063/1.5093848.

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Trivedi, Samarth, and Haim Grebel. "Field-effect transistors with graphene channels and quantum dots: Gate control and photo-induced effects." In 2011 IEEE 11th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2011. http://dx.doi.org/10.1109/nano.2011.6144614.

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Sirdeshmukh, Vedashree V., Harshika R. Apte, and Anup A. Kale. "Graphene Quantum Dots as promising probes in electrochemical immunoassay for rapid and sensitive detection of pathogenic Staphylococcus aureus." In 2019 IEEE 13th International Conference on Nano/Molecular Medicine & Engineering (NANOMED). IEEE, 2019. http://dx.doi.org/10.1109/nanomed49242.2019.9130608.

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